Here's another could-be name - one that exists as a word, but not as a name in the U.S. Sova (SO-vah) means "owl" in Czech, Slovenian, Slovakian, Bosnian and Croatian. This feminine noun comes from Proto-Slavic sova.
"Little owl" is cute as a nickname, but short and elegant Sova really brings something special to the table as a given name. In the U.S. this has not been used as a name more than 4 times in any given year, leaving us no SSA data. It does not appear on recent popularity charts in the countries in which it means "owl."